Heuchert, B. & Braun, U. 2014. Two new lichen-associated Trimmatostroma species. - Herzogia 27: 227–236.
The new species Trimmatostroma umbilicariicola on Umbilicaria sp. known from Canada and Peru and T. varicellariae on Varicellaria rhodocarpa known from Russia and Sweden are described, illustrated and compared with other lichenicolous species assigned to the genus Trimmatostroma. A revised key to the lichenicolous species of the genus is provided.